I only know of my experience and the 2 Meth users I have been around.
Both were ONLY jerky (especially in their sleep) or could not be still for longer than 2 minutes when they were USING. One of them had used Meth off and on for 20 yrs the other for only about 5 yrs
When they were clean, there was no jerky motions, no odors from them and they were able to sit still and at least watch a TV show or have a conversation.
Just my experience.